IITs have a preparatory course for the students belonging to communities which are backwards on academic grounds.
Considering the fact that these students might not have had the kind of support or environment required to crack JEE, these students are getting a chance to join educational opportunities.

Preparatory courses are for the sc/st and disabled person. As most of the peoples from sc/st are financially poor and also to encourage this people for further studies .

All the best.